Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
viec sach » viet sach, vien bach, dien sach
sach nuoc » sach duoc, cac nuoc, bach tuoc
cua triet » cua viet, su triet
hanh doi » thanh doi, hanh noi, hang doi
va triet » va thiet, va trien, ve triet
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
va hanh » van hanh, va thanh, va danh

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ky nang ma hoa. hieu viec sach nuoc va hanh doi ((cua triet) OR (va triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky nang ma hoa. hieu viec sach nuoc va hanh doi ((cua triet) OR (va triet))".
• Adding a wildcard symbol may retrieve word variants: so sach ky nang ma hoa. hieu viec sach nuoc va hanh doi ((cua triet) OR (va triet))*.